Every day, over 200 million Americans consume food products made of wheat. As a result, over 100 million of them experience some form of adverse health effect, ranging from minor rashes and high blood sugar to the unattractive stomach bulges that preventive cardiologist William Davis calls “wheat bellies.” According to Davis, that excess fat has nothing to do with gluttony, sloth, or too much butter: It’s due to the whole grain wraps we eat for lunch.

After witnessing over 2,000 patients regain their health after giving up wheat, Davis reached the disturbing conclusion that wheat is the single largest contributor to the nationwide obesity epidemic.